Note: Javascript is disabled or is not supported by your browser. For this reason, some items on this page will be unavailable. For more information about this message, please visit this page: About CDC.gov.

Facts About Soman

What soman is

Soman is a human-made chemical warfare agent classified as a nerve agent. Nerve agents are the most toxic and rapidly acting of the known chemical warfare agents. They are similar to pesticides (insect killers) called organophosphates in terms of how they work and the kinds of harmful effects they cause. However, nerve agents are much more potent than organophosphate pesticides.

Soman was originally developed as an insecticide in Germany in 1944.

Soman is also known as “GD.”

Soman is a clear, colorless, tasteless liquid with a slight odor similar to camphor containing mothballs or rotten fruit. It can become a vapor if heated.

Where soman is found and how it is used

It is possible that soman or other nerve agents were used in chemical warfare during the Iran-Iraq War in the 1980s.

Soman is not found naturally in the environment.

How people can be exposed to soman

Following release of soman into the air, people can be exposed through skin contact, eye contact, or breathing in the soman (inhalation).

Soman mixes easily with water; so it could be used to poison water. Following release of soman into water, people can be exposed by drinking contaminated water or getting contaminated water on their skin.

Following contamination of food with soman, people can be exposed by eating the contaminated food.

A person’s clothing can release soman after contact with its vapor, which can lead to exposure of other people.

Because soman vapor is heavier than air, it will sink to low-lying areas and create a greater exposure hazard there.

How soman works

The extent of poisoning caused by soman depends on how much soman a person was exposed to, how the person was exposed, and how long the the exposure lasted.

Symptoms will likely appear within a few seconds after exposure to the vapor form of soman, and within a few minutes to hours after exposure to the liquid form.

All the nerve agents cause their toxic effects by preventing the proper operation of an enzyme that acts as the body’s “off switch” for glands and muscles. Without an “off switch,” the glands and muscles are constantly being stimulated. They may tire and no longer be able to sustain function such as breathing.

Compared with other nerve agents, soman is more volatile than VX but less volatile than sarin. The higher a chemical’s volatility, the more likely it will evaporate from a liquid into a vapor and disperse into the environment. People can be exposed to the vapor even if they do not come in contact with the liquid form.

Because of its high volatility, soman is an immediate but short-lived threat and does not last a long time in the environment.

Because soman is more volatile than the nerve agent VX (the most potent nerve agent), it will remain on exposed surfaces for a shorter period of time compared with VX.

Immediate signs and symptoms of soman exposure

Although soman can have a camphor or fruity odor, the odor may not be noticeable enough to give people sufficient warning of a toxic exposure.

People exposed to a low or moderate dose of soman by breathing it in (inhalation), swallowing (ingestion), or skin absorption may experience some or all of the following symptoms within seconds to hours of exposure:

Abnormally low or high blood pressure

Blurred vision

Chest tightness

Confusion

Cough

Diarrhea

Drooling and excessive sweating

Drowsiness

Eye pain

Headache

Increased urination

Nausea, vomiting, and/or abdominal pain

Rapid breathing

Runny nose

Slow or fast heart rate

Small, pinpoint pupils

Watery eyes

Weakness

Even a tiny drop of nerve agent on the skin can cause sweating and muscle twitching where the agent touched the skin.

Exposure to a large dose of soman by any route may result in these additional adverse health effects:

Convulsions

Loss of consciousness

Paralysis

Respiratory failure possibly leading to death

Showing these signs and symptoms does not necessarily mean that a person has been exposed to soman.

What the long-term health effects are

Mildly exposed people usually recover completely. Severely exposed people are not likely to survive.

How people can protect themselves, and what they should do if they are exposed to soman

Recovery from soman exposure is possible with treatment, but the antidotes available must be used quickly (within minutes) to be effective. Therefore, the best thing to do is avoid exposure:

Leave the area where the soman was released and get to fresh air. Quickly moving to an area where fresh air is available is highly effective in reducing the possibility of death from exposure to soman vapor.

If the soman release was outdoors, move away from the area where the soman was released. Go to the highest ground possible, because soman is heavier than air and will sink to low-lying areas.

If the soman release was indoors, get out of the building.

If people think they may have been exposed, they should remove their clothing, rapidly wash their entire body with soap and water, and get medical care as quickly as possible.

Removing and disposing of clothing:

Quickly take off clothing that has liquid soman on it. Any clothing that has to be pulled over the head should be cut off the body instead of pulled over the head. If possible, seal the clothing in a plastic bag. Then seal the first plastic bag in a second plastic bag. Removing and sealing the clothing in this way will help protect people from any chemicals that might be on their clothes.

If clothes were placed in plastic bags, inform either the local or state health department or emergency personnel upon their arrival. Do not handle the plastic bags.

If helping other people remove their clothing, try to avoid touching any contaminated areas, and remove the clothing as quickly as possible.

Washing the body:

As quickly as possible, wash any liquid soman from the skin with large amounts of soap and water. Washing with soap and water will help protect people from any chemicals on their bodies.

Rinse the eyes with plain water for 10 to 15 minutes if they are burning or if vision is blurred.

If soman has been ingested (swallowed), do not induce vomiting or give fluids to drink.

Seek medical attention right away.

How soman exposure is treated

Treatment consists of removing soman from the body as soon as possible and providing supportive medical care in a hospital setting. Antidotes are available for soman. They are most useful if given as soon as possible after exposure. Clinicians should treat suspected cases accordingly and not wait for laboratory confirmation.